CAUSE This behavior can occur if the following registry value is corrupted: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\VirtualDeviceDrivers\VDD This behavior can occur after you install a 16-bit program or a program that uses a 16-bit installation program that is not Windows XP-compliant. This behavior can also occur if the Command.com file that is installed on your computer is damaged or is the incorrect version.
RESOLUTION To resolve this issue: 1. Start Registry Editor (Regedt32.exe or Regedit.exe).
NOTE: In Windows XP, Regedit.exe and Regedt32.exe have been integrated into a single program that combines the features of the two registry editors in Windows 2000.
2. Locate and select the following value: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\VirtualDeviceDrivers\VDD
3. On the Edit menu, click Delete.
4. On the Edit menu, point to New, and then click Multi-string Value.
5. Type VDD in the Value Name box, and then press ENTER.
6. Quit Registry Editor.